I've also noticed a few little oddities in the game and I'm thinking maybe these are bugs? I don't know. Only played 130 hours so far
To be honest I haven't really investigated coaches stats in detail. I just tend to look out the ones with the highest abilities generally and take it from there. What attributes are you finding helpful? I've also been on the end of conflicting advice so maybe I need to do some more research.
I'm laughing at Mr Malteser's screenshots there. I can only dream of working my way up to that level with those incredible budgets. Insane stuff. I have to suffer £5k a week wage budget if that!